#define  _CRT_SECURE_NO_WARNINGS 1


#include <stdio.h>
int main()
{
	int n;
	while (scanf("%d", &n) !=EOF)
		for(int i=0;i<n;i++)
	{
			for (int j = 0; j < n; j++)
			{
				if (i == 0 || i == n - 1)
				{
					printf("* ");
				}
				else if (j == 0 || j == n - 1)
				{
					printf("* ");
				}
				else
				{
					printf("  ");
				}
		
			}
			printf("\n");

	}
	return 0;
}